77 lines
2.1 KiB
Java
77 lines
2.1 KiB
Java
import com.rabbitmq.client.ConnectionFactory;
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import com.rabbitmq.client.Connection;
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import com.rabbitmq.client.Channel;
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import com.rabbitmq.client.QueueingConsumer;
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import com.rabbitmq.client.AMQP.BasicProperties;
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public class RPCServer {
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private static final String RPC_QUEUE_NAME = "rpc_queue";
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private static int fib(int n) {
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if (n ==0) return 0;
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if (n == 1) return 1;
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return fib(n-1) + fib(n-2);
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}
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public static void main(String[] argv) {
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Connection connection = null;
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Channel channel = null;
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try {
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ConnectionFactory factory = new ConnectionFactory();
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factory.setHost("localhost");
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connection = factory.newConnection();
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channel = connection.createChannel();
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channel.queueDeclare(RPC_QUEUE_NAME, false, false, false, null);
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channel.basicQos(1);
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QueueingConsumer consumer = new QueueingConsumer(channel);
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channel.basicConsume(RPC_QUEUE_NAME, false, consumer);
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System.out.println(" [x] Awaiting RPC requests");
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while (true) {
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String response = null;
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QueueingConsumer.Delivery delivery = consumer.nextDelivery();
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BasicProperties props = delivery.getProperties();
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BasicProperties replyProps = new BasicProperties();
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replyProps.setCorrelationId(props.getCorrelationId());
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try {
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String message = new String(delivery.getBody(),"UTF-8");
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int n = Integer.parseInt(message);
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System.out.println(" [.] fib(" + message + ")");
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response = "" + fib(n);
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}
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catch (Exception e){
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System.out.println(" [.] " + e.toString());
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response = "";
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}
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finally {
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channel.basicPublish( "", props.getReplyTo(), replyProps, response.getBytes("UTF-8"));
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channel.basicAck(delivery.getEnvelope().getDeliveryTag(), false);
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}
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}
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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finally {
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if (connection != null) {
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try {
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connection.close();
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}
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catch (Exception ignore) {}
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}
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}
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}
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}
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